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Lisa, an experienced shipping clerk can fill an order in 9 hours. Felipe a clerk needs 11 hours to do the same job. Working together how long will it take them to fill the order.

 Mar 1, 2020
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Lisa =L

Felipe =F

 

1/L + 1/F =1 / T

1/9 +1/11 =20/99

T = 99 / 20 = 4.95 hours to finish the order when working together.

 Mar 1, 2020

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